To leap wildly in a game (6)
I believe the answer is:
pelota
'game' is the definition.
(pelota is a kind of game)
'to leap wildly' is the wordplay.
'wildly' indicates an anagram.
'to'+'leap'='toleap'
'toleap' with letters rearranged gives 'PELOTA'.
'in a' is the link.
(Other definitions for pelota that I've seen before include "Basque ball game" , "Basque ball-game" , "Spanish game played with a ball and wickerwork racket" , "Spanish game at Opel" , "SPORT/GAME" .)